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74ba5156df
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84585531d4
@ -4,4 +4,4 @@
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#include <cstdint>
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#include <vector>
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std::vector<uint8_t> b64_decode(const uint8_t* input, size_t len);
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std::vector<uint8_t> b64_decode(const uint8_t *input, size_t len);
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@ -59,11 +59,6 @@ class KggTask {
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}
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auto qmc2 = QMC2::Create(ekey);
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if (!qmc2) {
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error(L"create qmc2 instance failed (ekey decode error?)");
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fprintf(stderr, "%s\n", ekey.c_str());
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return;
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}
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std::string magic(4, 0);
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kgg_stream_in.seekg(offset_to_audio, std::ios::beg);
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@ -3,31 +3,39 @@
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#include "tc_tea.h"
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#include <algorithm>
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#include <array>
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#include <string>
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#include <array>
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#include <vector>
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const static std::string kEKeyV2Prefix = "UVFNdXNpYyBFbmNWMixLZXk6";
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const static std::array<uint8_t, 16> kEKeyV2Key1{
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0x33, 0x38, 0x36, 0x5A, 0x4A, 0x59, 0x21, 0x40, 0x23, 0x2A, 0x24, 0x25, 0x5E, 0x26, 0x29, 0x28,
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0x33, 0x38, 0x36, 0x5A, 0x4A, 0x59, 0x21, 0x40,
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0x23, 0x2A, 0x24, 0x25, 0x5E, 0x26, 0x29, 0x28,
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};
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const static std::array<uint8_t, 16> kEKeyV2Key2{
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0x2A, 0x2A, 0x23, 0x21, 0x28, 0x23, 0x24, 0x25, 0x26, 0x5E, 0x61, 0x31, 0x63, 0x5A, 0x2C, 0x54,
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0x2A, 0x2A, 0x23, 0x21, 0x28, 0x23, 0x24, 0x25,
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0x26, 0x5E, 0x61, 0x31, 0x63, 0x5A, 0x2C, 0x54,
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};
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template <typename T>
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std::span<T> ss2span(std::string_view sv) {
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auto* data = reinterpret_cast<const T*>(sv.data());
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return std::span<T>(const_cast<T*>(data), sv.size());
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template <typename T> std::span<T> ss2span(std::string_view sv) {
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auto *data = reinterpret_cast<const T *>(sv.data());
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return std::span<T>(const_cast<T *>(data), sv.size());
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}
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template <typename T>
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std::string_view span2ss(std::span<T> span) {
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return std::string_view(reinterpret_cast<char*>(span.data()), span.size());
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template <typename T> std::string_view span2ss(std::span<T> span) {
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return std::string_view(reinterpret_cast<char *>(span.data()), span.size());
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}
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void remove_trailing_zeros(std::vector<uint8_t> &vec) {
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auto it = std::find_if(vec.rbegin(), vec.rend(),
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[](uint8_t value) { return value != 0; });
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vec.erase(it.base(), vec.end());
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}
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std::vector<uint8_t> decrypt_ekey_v1(std::string_view ekey) {
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std::vector<uint8_t> result = b64_decode(reinterpret_cast<const uint8_t*>(ekey.data()), ekey.size());
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std::vector<uint8_t> result =
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b64_decode(reinterpret_cast<const uint8_t *>(ekey.data()), ekey.size());
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remove_trailing_zeros(result);
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uint32_t tea_key[4] = {
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0x69005600 | static_cast<uint32_t>(result[0] << 16) | (result[1]),
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@ -10,11 +10,8 @@ constexpr size_t kTeaBlockSize = 8;
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constexpr size_t kFixedSaltLen = 2;
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constexpr size_t kZeroPadLen = 7;
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inline void decrypt_round(uint8_t* p_plain,
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const uint8_t* p_cipher,
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uint64_t* iv1,
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uint64_t* iv2,
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const uint32_t* key) {
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inline void decrypt_round(uint8_t *p_plain, const uint8_t *p_cipher,
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uint64_t *iv1, uint64_t *iv2, const uint32_t *key) {
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uint64_t iv1_next = Endian::be_u64_read(p_cipher);
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uint64_t iv2_next = tc_tea_ecb_decrypt(iv1_next ^ *iv2, key);
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uint64_t plain = iv2_next ^ *iv1;
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@ -23,7 +20,8 @@ inline void decrypt_round(uint8_t* p_plain,
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Endian::be_u64_write(p_plain, plain);
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}
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std::vector<uint8_t> tc_tea_cbc_decrypt(std::span<uint8_t> cipher, const uint32_t* key) {
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std::vector<uint8_t> tc_tea_cbc_decrypt(std::span<uint8_t> cipher,
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const uint32_t *key) {
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// It needs to have at least 2 blocks long, due to the nature of the padding
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// scheme used.
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if (cipher.size() % kTeaBlockSize != 0 || cipher.size() < kTeaBlockSize * 2) {
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@ -33,7 +31,7 @@ std::vector<uint8_t> tc_tea_cbc_decrypt(std::span<uint8_t> cipher, const uint32_
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uint64_t iv1 = 0;
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uint64_t iv2 = 0;
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uint8_t header[kTeaBlockSize * 2];
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const uint8_t* in_cipher = cipher.data();
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const uint8_t *in_cipher = cipher.data();
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decrypt_round(header, in_cipher, &iv1, &iv2, key);
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in_cipher += kTeaBlockSize;
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decrypt_round(header + kTeaBlockSize, in_cipher, &iv1, &iv2, key);
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@ -52,7 +50,8 @@ std::vector<uint8_t> tc_tea_cbc_decrypt(std::span<uint8_t> cipher, const uint32_
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if (real_plain_len != copy_len) {
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// Decrypt the rest of the blocks
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for (size_t i = cipher.size() - kTeaBlockSize * 3; i != 0; i -= kTeaBlockSize) {
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for (size_t i = cipher.size() - kTeaBlockSize * 3; i != 0;
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i -= kTeaBlockSize) {
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decrypt_round(p_output, in_cipher, &iv1, &iv2, key);
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in_cipher += kTeaBlockSize;
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p_output += kTeaBlockSize;
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@ -6,9 +6,11 @@
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#include <span>
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#include <vector>
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std::vector<uint8_t> tc_tea_cbc_decrypt(std::span<uint8_t> cipher, const uint32_t* key);
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std::vector<uint8_t> tc_tea_cbc_decrypt(std::span<uint8_t> cipher,
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const uint32_t *key);
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inline std::vector<uint8_t> tc_tea_cbc_decrypt(std::span<uint8_t> cipher, const uint8_t* key) {
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inline std::vector<uint8_t> tc_tea_cbc_decrypt(std::span<uint8_t> cipher,
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const uint8_t *key) {
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uint32_t key_u32[4];
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for (int i = 0; i < 4; i++) {
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key_u32[i] = Endian::be_u32_read(key + i * 4);
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